When try to run sqlplus from xterm, it gives an following error :
$ /usr/app/oracle_sw_owner/oracle/product/10.1.0/EM10g_1/bin/sqlplus
Message file sp1<lang>.msb not found
Error 6 initializing SQL*Plus

After installation there is an information is given for Enterprise Manager Grid Control and it gives an url as http://localhost.localdomain:7777/em. But when i try to connect it gives an error massage as "The connection was refuse when attempting to contact localhost.localdomain:7777"
Same situation when i try to connect Enterprise Manager Application Server (its url: http://localhost.localdomain:1810). It gives an error massage "The connection was refuse when attempting to contact localhost.localdomain:1810"